SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a3202a9a7540b534f7f0d06a02d4aab762e4615b8e8db4accec58d024b5eeb' 
  AND token = 'yGQxg7AwbfKgnRBTdFJuJo3i0RVAYMHz9wWuW6jvM+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}